Consists of letters and postcards written to Asa Gray from 37 correspondents with surnames starting with the letters McA-Ma, arranged alphabetically by sender. Correspondents are: William Gibbs McAdoo, Thomas Huston McBride, Gerald McCarthy, C.M. McClung, Thomas McCulloch, Maria McGilvray, George W. MacKay, Alexander McKenzie, P.W. Maclagan, John Maclean, Alexander Macmillan, Conway MacMillan, John H.H. McNamee, W.F. Macrae, James Melville Macoun, Peter MacOwan, Paul Magnus, Joseph Henry Maiden, John Michael Maisch, Ernest Malinvaud, W. Albert Manda, Benjamin, Pickman Mann, Horace Mann Jr., Robert Manning, Othniel Charles Marsh, Ugolino Martelli, A.F. Martin, Isaac Comly Martindale, Charles Martins, Carl Friedrich Philipp von Martius, Nevil Story Maskelyne, Charles F. Mason, Stevens Thomson Mason, G. Masson, Maxwell Tylden Masters, W. Matthews, and Charles Maximowicz
Gray Correspondence Files, Archives of the Gray Herbarium, Harvard University Herbaria
Selected letters of Asa Gray were published in: Gray, Jane Loring, ed. Letters of Asa Gray (1893)
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